Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30
The AirTAC SAIJ40X70-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel down from the 70 mm nominal stroke to a minimum of 40 mm. This yields a 40-70 mm usable window, ideal for dialing in end positions during commissioning without swapping hardware. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a PT tapered G1/4 port.
This specific SKU is configured with a SUS304 stainless steel rod for superior corrosion resistance and features adjustable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides, and while this unit lacks a magnet, adding one enables compatibility with CMSE reed and DMSE electronic sensors.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 Is Used
Machine Setup Tuning
Dial in the exact 40-70 mm travel during commissioning to perfect a pressing or clamping operation without machining custom spacers.
Product Changeover
Quickly adjust the retract end-position on a packaging line when switching to a different product size, saving setup time.
Variable End Stops
Use the rear stopper to establish a precise, repeatable end-of-stroke location for light assembly tasks within the 70 mm window.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, or step down to a 32 mm bore (providing 402 N push at 0.5 MPa) for lighter loads. The primary advantage of selecting the SAIJ over a fixed SAI cylinder is the external rear stopper, which acts as a variable end-stop for product changeovers rather than requiring external shims. The rear adjuster and air cushions only decelerate the travel end; they do not hold the load without live air. For true load-holding without pneumatic pressure, consider the SAIL or BSAI series, or use an external rod lock. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-30 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can generate up to 1130 N of push force.
The rear adjuster screw allows you to shorten the effective stroke by up to 30 mm from the 70 mm nominal length, creating a 40-70 mm usable travel window. This stopper only sets the end position and does not lock the load without live air pressure.
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